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ADM1172 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADM1172
Description  2.7 V to 16.5 V Hot Swap Controller with Power-Fail Comparator
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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ADM1172 Datasheet(HTML) 1 Page - Analog Devices

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2.7 V to 16.5 V Hot Swap Controller
with Power-Fail Comparator
ADM1172
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
GENERAL DESCRIPTION
Controls supply rails from 2.7 V to 16.5 V
The ADM1172 is a hot swap controller that safely enables a
printed circuit board to be removed and inserted to a live
backplane. This is achieved using an external N-channel power
MOSFET with a current control loop that monitors the load
current through a sense resistor. An internal charge pump is
used to enhance the gate of the N-channel FET. When an over-
current condition is detected, the gate voltage of the FET is
reduced to limit the current flowing through the sense resistor.
During an overcurrent condition, the TIMER pin capacitor
determines the amount of time the FET remains at a current
limiting mode of operation until it is shut down. The ON
(ON-
Allows protected board removal and insertion to a live
backplane
External sense resistor provides adjustable analog current
limit with circuit breaker
Peak fault current limited with fast response
Charge pumped gate drive for external N-FET switch
Power-fail comparator
Automatic retry or latch-off during current fault
Undervoltage lockout
8-lead, TSOT package
CLR) pin is the enable input for the device and can be
used to monitor the input supply voltage. The ADM1172
operates with a supply voltage ranging from 2.7 V to 16.5 V.
APPLICATIONS
Hot swap board insertion: line cards, raid systems
Industrial high-side switches/circuit breakers
The ADM1172 also features a power-fail comparator. The
voltage on the PFI pin is compared with an internal 0.6 V
reference, and the output of this comparator is presented on
the PFO pin. This device is available in two options: the
ADM1172-1 with automatic retry for overcurrent fault and the
ADM1172-2 with latch-off for an overcurrent fault. Toggling
the ON (ON-
Electronic circuit breakers
CLR) pin resets a latched fault. The ADM1172 is
packaged in an 8-lead TSOT.
FUNCTIONAL BLOCK DIAGRAM
LONG
VIN = 5V
VOUT = 5V
VCC
RSENSE
Q1
CTIMER
LONG
SHORT
SENSE
GATE
ON
TIMER
PFI
PFO
ADM1172-1
GND
GND
GND
RON1
RON2
RPR1
CLOAD
RPR2
Figure 1.


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